"Why History Needs Software Piracy" is a very well written piece by Benj Edwards where he explains why at this moment in time only piracy safe software, but also any other digital information, from being lost in history. I suggest you read the whole text, but here are some qoutes:
If VHS tapes worked like app stores, George Lucas could force all of us to upgrade our purchased Star Wars films to the Special Edition versions (to maintain compatibility with LucasOS, of course), overwriting the old ones in the process.
The fact that people still buy access to digital media in large numbers means that piracy is simply not the problem they think it is. In fact, piracy is itself the solution to another problem: the problem of over-protected intellectual property. It would be wonderful if those companies utilizing strict DRM and pushing for aggressive anti-piracy legislation saw the need to be a little less profiteering for the greater historical good, but since that is rarely the objective of the free market, don’t hold your breath.